uncovered new information about the kevin collins disappearance. including how they are now calling dan therrian - a person of interest. therrian - who had a criminal record. including lewdness with a minor. was interviewed shortly after kevin went missing in 1984. kron four's terisa estacio talked with the chief about whether he has any regrets about how the case was handled years ago. and how he is personally committed to finding kevin's killer. >> reporter: sf police chief greg suhr had only been on the force for a few years when kevin collins went missing. >> ttthere wasn't a lead we didn't follow. from feb 10 in 1984, whatever. it was a city mission to find that boy. >> reporter: and according to suhr - it was also a peron misison then. and now. 21 25 people will say..hey >> did you find that boy. and we know exactly, they are taling about kevein collins. >> reporter: suhr says - he is not surprised that after all o fthese years, dectivtives are finding new leads - such as now calling this man, dan therrian a person of interest. dept. at the l